 According to one source, Jarl Knut was married to daughter of King Canute I of Sweden, named Sigrid Knutsdotter.The same source states that Knut's son of Bjälboätten was born of Sigrid.Knut Birgersson was killed in 1208 at the Battle of Lena, where King Sverker lost his throne to the new king Eric X of Sweden ("Erik Knutsson"), the only remaining son of King Canute.